Since the eInk display doesn’t use a lot of juice, your Kindle can last for days on a charge. Still, there are times when the battery may drain quickly, usually due to the wireless radio. If you’re in an area where the integrated 3G technology can’t find a signal—on an airplane, or in an area with low or non-existent 3G coverage—the radio will constantly search for one, thus draining the battery much faster. To turn wireless off, press Menu > Wireless Off. Or you can turn the Kindle completely off by holding the power slide to the right for about five seconds until the screen goes blank.